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Crystallization Behavior of PP in Composites with EPDM and a Surface Modified Nano-Calcium Carbonate

¹ Key Laboratory of Rubber-plastics, Ministry of Education, Qingdao 266042, China, College of Materials Science and Engineering, South China University of Technology, Guangzhou 510640, China
² College of Materials Science and Engineering, South China University of Technology, Guangzhou 510640, China

^* To whom correspondence should be addressed.

	Abstract

A modified nano-CaCO₃ (RCCR) was prepared by mixing the stearic acid treated nano-CaCO₃ (CCR) with organic agent containing –OH, –COOH, and C=C groups and it was then melt compounded with polypropylene PP and Ethylene-propylene-diene mischpolymer (EPDM) to prepare PP/EPDM/nano-CaCO₃ composites. The effects of RCCR on the crystallization behavior of PP in the composites were studied by DSC. The crystal type structure of PP in the composites was studied by x-ray diffraction and polarized optical microscope (POM). It was found that RCCR acts as a nucleating agent. It initiates PP crystallizing at higher temperature, and lowers degree of crystallinity and crystal size, and induces the formation of crystallite. RCCR in collaboration with EPDM can obviously increase the content of crystallite. Isothermal crystallization studies reveal that the activation energy of PP in PP/EPDM/RCCR is lower than that of PP/EPDM/CCR.

Key Words: polypropylene, EPDM, nano-calcium carbonate, nucleation, crystallization.

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